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Hilled RowsDig straight, shallow trenches, two to three feet apart, in prepared soil. Plant seed potatoes 12 inches apart and cover with about 3 inches of soil. When the shoots reach 10 to 12 inches tall, use a hoe or shovel to scoop soil from between rows and mound it against the plants, burying the stems halfway. Repeat as needed through the growing season to keep the tubers covered.Straw MulchPlace seed potatoes on the surface of prepared soil, following the spacing specified for hilled rows, and cover them with three to four inches of loose, seed-free straw. Mound more straw around the stems as they grow, eventually creating a layer of one foot or more in depth.Raised BedLoosen the soil in the bottom of a half-filled raised bed. Space seed potatoes about 12 inches apart in all directions and bury them 3 inches deep. As the potatoes grow, add more soil until the bed is filled. If possible, simplify harvest by removing the sides. This method yielded the largest harvest in my trials, and the potatoes were uniformly large in size.